Joan got A's on all her homework assignments, so if she had gotten an A on her term paper, she could pass the course even without doing the class presentation. Unfortunately, she did not get an A on her term paper, so it is obvious that she will have to do the class presentation to pass the course.
The argument's reasoning isquestionable because the argument
Fact: A's in homework assignment
P: 'A' in term paper Q: Pass the examination w/o presentation P -> Q
Valid conclusion
...
The argument's reasoning isquestionable because the argument
Fact: A's in homework assignment
P: 'A' in term paper Q: Pass the examination w/o presentation P -> Q
Valid conclusion
...



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